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問題一覧
1
It is the most frequently used measure of variation
STANDARD DEVIATION
2
A statement of the extent of random variation in any series of measurement
STANDARD DEVIATION
3
measure of the distribution of values around the mean
STANDARD DEVIATION
4
commonly caused by a bias In volumetric dispensing of thespecimen aliquot
PROPORTIONAL VARIABILITY
5
commonly observed in analytical procedures that are Influenced by the turbidity of the speclmen
CONSTANT VARIABILITY
6
Sources cannot be completely controlled or identified it increase the extent of variability of resultsand the SD, but the mean is largely unaffected
RANDOM ERROR
7
Series of values on the control chart that continue to increase or decrease for at least a period of six (6)consecutive days
TREND
8
Method used to validate a particular measurement process
PROFICIENCY TESTING SURVEY
9
Specimens that have known concentration of an analyte for the test of interest.
PROFICIENCY SAMPLE
10
labs in a geographic region use the lots of QC specimen each day for their internal QC programs
REGIONAL QC PROGRAM
11
x=
EACH SCORE
12
x bar=
MEAN
13
n=
NUMBER OF VALUE
14
summation=
SUM ACROSS THE VALUE
15
Square of the standard deviation used to detect significant differences between groups of data and determine contributions of various factors to the total variation
VARIANCE, s²
16
Percentile expression of the mean that measure of the relative magnitude of variability
COEFFICIENT OF VARIATION
17
QUALITY CONTROL Associated Activities
ASSAY OF CONTROL SAMPLE, INSTRUMENT MAINTENANCE
18
Reported values do not fall along the line of slope when graphed which Reported lab results do not correspond to the correct value
ANALYTICAL BIAS
19
Types of Analytical Bias:
PROPORTIONAL, CONSTANT, COMBINED
20
Problem on Accuracy (Bias) =
SYSTEMATIC ERROR
21
Refers to laboratory analyses that are subject to imprecision
RANDOM ANALYTICAL VARIABILITY
22
Problem on Precision (CV) =
RANDOM ERROR
23
one method gives values that are higher (or lower) than those from the other by an amount that is proportional to the level of the measured variable.
PROPORTIONAL BIAS
24
persists consistently over time for a specific instrument, operator, or configuration
CONSTANT BIAS
25
one method gives values that are higher (or lower) than those from the other by an amount that is proportional to the level of the measured variable.
PROPORTIONAL BIAS
26
Random Analytical Variability types
PROPORTIONAL, CONSTANT
27
Displace the mean value on one direction (may be up or down), but do NOT affect the overall variability as shown by the SD value
SYSTEMATIC ERROR
28
TYPES OF SYSTEMATIC ERRORS:
TREND, SHIFT
29
DIVISIONS of QUALITY CONTROL
INTRALABORATORY, INTERLABORATORY
30
Q.C. procedures performed on a daily basis within individual laboratories
INTRALABORATORY
31
Performed on a less frequent basis (e.g. 3x a year) to compare performance b/w or among laboratories
INTERLABORATORY
32
a control value that goes beyond ±2SD
OUTLIER
33
seeks to identify, measure, and eliminate the large gaps of inefficiency in a process
SIX SIGMA
34
Provides a display of the differences b/w the observed values & the expected mean and used to monitor small shifts in the process mean.
CUMULATIVE SUM CHART
35
found in clinical Laboratories with microcomputer Q.C. programs
DECISION LIMIT CUSUM
36
Laboratory’s observed mean for material A (Y-axis) compared to the observed mean for material B (X-axis). Information about the nature of the SE can be obtained when two diff. control materials have been analyzed
YOUDEN PLOT, SCATTER DIAGRAM
37
Presents information in an efficient, graphical format. Accomplished with a simple listing of items
CHECK SHEET
38
Used to identify factors that have the greatest cumulative effect on the system
PARETO CHART
39
Used to associate multiple possible causes with a single effect
ISHIKAWA, FISH BONE DIAGRAM
40
Pictorial representations of a process and used in identifying where errors are likely to be found in the system
FLOW CHART
41
Provides a simple, graphical view of accumulated data, including its dispersion & central tendency and Ease of construction
HISTOGRAM
42
Uses a series of control rules for interpreting data - False rejection is kept low - Error detection is improved - Analyse samples of the control material by the analytical method to be evaluated (at least 20 days)
WESTGARD MULTIRULE CHART
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